Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

JOURNAL OF POWER SOURCES

卷:273

Article

Bello, Abdulhakeem¹  Barzegar, Farshad¹  Momodu, Damilola¹  Dangbegnon, Julien¹  Taghizadeh, Fatemeh¹  Fabiane, Mopeli¹  Manyala, Ncholu¹ 

[1] Univ Pretoria, SARChI Chair Carbon Technol & Mat, Inst Appl Mat, Dept Phys, ZA-0028 Pretoria, South Africa

关键词: Graphene foam;    Polyvinyl alcohol;    Formaldehyde;    KOH activation;    Asymmetric supercapacitor;   

DOI  :  10.1016/j.jpowsour.2014.09.094

来源: Elsevier

【 摘 要 】

We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and activated carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum energy density of 42 mWh cm(-2), a power density of 0.5 W cm(-2) and 98% retention of its initial capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na2SO4 aqueous electrolyte. This work shows the great potential of this material for high performance energy storage application. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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